酯键

methyl ester

α-methoxyisobutyric acid 3-p-menthyl ester

methyl-acetoacetic ester

glyceryl ester

2,5-thiophene dicarboxylic acid diethyl ester

salicylic acid propyl ester

hydroxy carboxylic acid ester, aromatic, polycyclic

dicarboxylic acid ester, saturated